Abstract: A cooling or heating system creating an open, unbounded, temperature-controlled zone for personnel having HVAC equipment for producing and delivering cooled or heated air, an apertured deck member capable of supporting personnel, and air delivery conduits connecting the HVAC equipment with said deck member. The system may be transportable.

Abstract: A portable and collapsible livestock feeder, is designed for both easy erection and also for collapsed storage for transport, manual or otherwise. The side panels of the feeder are hinged, or otherwise pivotally secured, to a back panel of the structure, and a hinged bottom is also attached to the back panel. A feeder grate maintains a lower horizontal pivotal connection with the back panel, but is releasably attached, when in a forwardly sloping condition, at its upper portion to and between the side panels. Releasing the grate from the side panels enables the grate to be thrust back and swing against the back panel for storage when the side panels are collapsed over the grate. Tail gate support brackets are provided for mounting the feeder. The grate extends upwardly above the collapsed feeder to provide a handle.